Round-head keyhole sartorius

Abstract

The round-head keyhole sartorius of the present invention includes: needle bar that moves up and down; feeding device which supports the feeding platform fixed by a pair of cloth plate on the left and right of the sewed cloth; one pair of needle plate which can be assembled and disassembled on the left and right of the said cloth plate; and thread cutting device for cutting the thread that extends from the sewing finish position of the round-head keyhole stitch by upper reamer and lower reamer, the sartorius is characterized in that, the said cloth plate can assemble and disassemble pluralityof said needle plates on the tail of the round-head keyhole stitch whose length in the front and back direction will increase in ladder shape when the length in the front and back direction increasesa prescribed length, predetermine the length in the front and back direction of the said plurality of needle plates and the install position of the said cloth plate, thereby, when looking from the top of said cloth plate, the sewing finish position of the round-head keyhole stitch is relativity at a certain position relative to the said thread cutting device.

Description

technical field [0001] The invention relates to a buttonhole sewing machine for sewing buttonhole stitches composed of a round head and a tail, in particular to a buttonhole sewing machine capable of sewing buttonhole stitches of different lengths. Background technique [0002] The eyelet buttonhole sewing machine has a needle bar, a looper, a feeding table that supports the object to be sewn for eyelet buttonhole sewing, and a thread trimmer provided inside the feeding table. The thread cutting device cuts off the bobbin thread and core thread at the same time when the buttonhole sewing ends. [0003] In Japanese Laid-Open Patent Publication No. 2001-321589 (Prior Art Document 1), a buttonhole sewing machine having a thread cutting device is described. On the right side cloth bearing plate on the right side of the center line of the round head keyhole stitch (the stitch formed by the round head and the tail extending linearly from the round head), the upper cloth is rotata...

AI Technical Summary

Problems solved by technology

However, in the upper knife replacement operation, it is necessary to remove the cloth bearing plate on the right side and then remove the step screw to disconnect the connecting rod, which requires a lot of work time and labor.

Therefore, it is not easy to replace the upper knife, and it is necessary to prepare a variety of upper knives according to the type of needle plate.

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